The Michel parameters, usually denoted by ρ , η , ξ {\displaystyle \rho ,\eta ,\xi } and δ {\displaystyle \delta } , are four parameters used in describing the phase space distribution of leptonic decays of charged leptons, l i − → l j − ν i ν j ¯ {\displaystyle l_{i}^{-}\rightarrow l_{j}^{-}\nu _{i}{\bar {\nu _{j}}}} . They are named after the physicist Louis Michel.
The Michel parameters, usually denoted by ρ , η , ξ {\displaystyle \rho ,\eta ,\xi } and δ {\displaystyle \delta } , are four parameters used in describing the phase space distribution of leptonic decays of charged leptons, l i − → l j − ν i ν j ¯ {\displaystyle l_{i}^{-}\rightarrow l_{j}^{-}\nu _{i}{\bar {\nu _{j}}}} . They are named after the physicist Louis Michel.
Source: Wikipedia "Michel parameters" · CC BY-SA 4.0
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